by Mike Garafolo, USA TODAY Sports

by Mike Garafolo, USA TODAY Sports

That much became clear Monday, late in the Philadelphia Eagles' first organized team activities practice, when the rookie NFL coach saw something fullback and tight end Emil Igwenagu did incorrectly while running a route.

Kelly called out for Igwenagu, but the second-year player didn't hear him over the music. So Kelly started walking toward him, but stopped when he realized the next play was about to be run. There's officially a new coach and a new practice tempo in town.

"We're so used to getting in the huddle and going back and talking to coach and getting a coaching point. There's no time for that," said Michael Vick, who split first-team reps at quarterback with Nick Foles. "You've gotta go, you've gotta go. That was my biggest thing. I was looking at (offensive coordinator Pat) Shurmur for a tip or Chip for a tip to see if I did it the right way.

"We just gotta keep going, and that's good because that's what you've gotta do in the game. Everything's not going to be perfect, so you've got to keep going and keep moving."

These players were moving all right - from station to station, drill to drill and even side to side while dancing to the music.

Van Halen, AC/DC, the Dropkick Murphys, Nicki Minaj, Pitbull and Shakira â?? you name it, it's on Kelly's in-practice iPod. The only time the music stops is during the "teaching" periods when a computerized voice that sounds a lot like like Hal from 2001: A Space Odyssey announces the next period.

That film was Stanley Kubrick's view of the future. This is the future of the NFL, Kelly style, in which most corrections are made in the classroom, not on the field.

"There's not very much standing around," wide receiver Jeremy Maclin said. "If you catch the ball, there's not much time to celebrate. If you drop a ball, there's not much time to get down on yourself. You have to get back to the line and run the next play."

With a grin Maclin added of the music, "Sometimes, you catch yourself nodding a little bit, but you understand what's going on."

What's going on is Kelly has his reasons. He's been considered a revolutionary coach with his offensive scheme but also the tempo and tactics he's used since his days as the Oregon coach. Earlier this offseason, Eagles general manager Howie Roseman told USA TODAY Sports he heard a pounding bass line coming from the auditorium. Roseman walked into the room and was told by special teams coordinator Dave Fipp that the purpose of the music was to get the players' "neurological pathways open."

Kelly would explain the full reasoning for the music at practice to reporters. But like an on-field correction, there's no time for that.

"There's a lot of science behind it," Kelly said, "but I've got 12 minutes left in this (press conference), so I can't really get into the details of it."

The players seem to think the music is all about communication. As for the tempo, well, that's what they're expecting on Sundays in the fall. Right now, it's about getting conditioned to run at that pace.

Even before the play is over, as a defensive player is giving a light tap to the ball carrier to signify a tackle in these limited-contact drills, the coaches on the sideline are already signaling in the next play call.

"Quick, it's quick, we run a bunch of plays at a time. It's quick," left tackle Jason Peters said, speaking nearly as quickly as Kelly.

Asked how the big guys up front are holding up, Peters grinned and said, "We'll be all right. We're either going to score quick or sit down quick."

Monday was the first day of full-team OTAs, so there was more sitting than scoring. But don't misunderstand here. Kelly's practices are fast, well-choreographed, hip and different, but they include the same mistakes and gaffes as any other team's sessions in May.

Vick and running back Chris Polk fumbled a handoff exchange. Foles came out of the huddle looking confused on one play. DeSean Jackson muffed a punt. The final period included way too many false starts and defenders jumping offsides.

But again, it's May. And the point of these practices is to get acclimated to the system and the pace.

"You've got 90 guys (on the roster) now, so I know you hear a lot of guys (say), 'I didn't get a chance to get my reps,'" Kelly said. "I don't think anybody on our team is going to complain about the amount of reps they got."

Quarterback Dennis Dixon, who played for Kelly at Oregon, seemed up to speed â?? literally and figuratively. He was often clapping his hands, as if to tell his teammates, "Let's move!"

Foles got a pat on the backside from Kelly when the quarterback hit Riley Cooper up the middle after carrying out a shotgun-draw play action. Vick got a head nod and clap from Kelly after firing a lateral overhand as he sprinted to his right on an option play. What would be a no-no in any other team's offense was exactly what Kelly wanted to see on that play.

Meanwhile - and this has nothing to do with the offense but rather more of the science Kelly doesn't have time to explain - a man with a camera at the top of a pole (a team spokesman called it "pole cam," fittingly enough) was running around the field to capture angles apparently the cameras high above the field on the scissor lifts can't see.

Above their heads, a police helicopter buzzed a few times. Maybe in response to neighbors' complaints about the noise?

They should get used to it. The players are.

"We know we can't practice full-speed for the entire time we're out there, so it's got to be short bursts, but the game of football is short bursts," Kelly said. "It's really an anaerobic sport when you look at it because you're going hard for five to six second and then you're taking a break. That's what we're trying to get accomplished with these guys."